Ninja Gaiden III: The Ancient Ship of Doom Cheats For NES

Reappearing 1-up glitch

In Stage 6-2B, grab the 1-up, backtrack to 6-2A, then return to 6-2B. The 1-up will have reappeared, along with all other power-ups in the room. You can repeat this process until the timer runs out.

In Stage 7-2D, grab the 1-up, backtrack to 7-2C, then return to 7-2D. The 1-up will have reappeared, including all other power-ups in the room. Again, this can be done repeatedly until the timer runs out.

Full HP

99 Continues

At the title screen, let it fade out to the intro and press Start to go back to the title screen again, repeat this 6 more times (you should have seen the title screen a total of 8 times), at the 8th title screen, press and hold Up, Left, A, B & Select and press Start. If done right, you'll have 99 continues.